/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.quicksearchbox.util;
import java.util.LinkedList;
import java.util.concurrent.Executor;
/**
* A simple executor that maintains a queue and executes one task synchronously every
* time {@link #runNext()} is called. This gives us predictable scheduling for the tests to
* avoid timeouts waiting for threads to finish.
*/
public class MockExecutor implements Executor {
private final LinkedList<Runnable> mQueue = new LinkedList<Runnable>();
private boolean mClosed = false;
public void execute(Runnable task) {
if (mClosed) throw new IllegalStateException("closed");
mQueue.addLast(task);
}
public void cancelPendingTasks() {
mQueue.clear();
}
public void close() {
cancelPendingTasks();
mClosed = true;
}
public int countPendingTasks() {
return mQueue.size();
}
public boolean runNext() {
if (mQueue.isEmpty()) {
return false;
}
Runnable command = mQueue.removeFirst();
command.run();
return true;
}
}